Android Studio and keyboard freezing problem

Looks like Android Studio has problems with keyboard in linux OS.

iBus daemon is the main suspect. I've tried many tricks and hacks but the problem remains, keyboard freezes after a short period of time!

The only solution for me is to download and use Java JDK 8! 

Arduino IDE OPEN/SAVE problem in Ubuntu

Finally, Arduino UNO has arrived. I've downloaded IDE tool and tested some examples. But a serious problem appeared that gave me a headache! Open and Save feature stops with a Java NullPointer Exception!!!

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: NullPointerException
at sun.awt.motif.MFileDialogPeer.setFont(Native Method)
at sun.awt.motif.MComponentPeer.initialize(MComponentPeer.java:182)
at sun.awt.motif.MComponentPeer.init(MComponentPeer.java:226)
at sun.awt.motif.MWindowPeer.init(MWindowPeer.java:103)
at sun.awt.motif.MDialogPeer.<init>(MDialogPeer.java:39)
at sun.awt.motif.MFileDialogPeer.<init>(MFileDialogPeer.java:24)
at sun.awt.motif.MToolkit.createFileDialog(MToolkit.java:263)
at java.awt.FileDialog.addNotify(FileDialog.java:265)
at java.awt.Dialog.conditionalShow(Dialog.java:887)
at java.awt.Dialog.show(Dialog.java:1035)
at java.awt.Component.show(Component.java:1584)
at java.awt.Component.setVisible(Component.java:1536)
at java.awt.Window.setVisible(Window.java:842)
at java.awt.Dialog.setVisible(Dialog.java:986)
at processing.app.Base.handleOpenPrompt(Base.java:649)
at processing.app.Base$3.actionPerformed(Base.java:906)

There was no answer even after some google searches. I was so disapointed that I setup Eclipse with AVR plugin to do my experiments. Examining the "AWT-EventQueue-0" error I looked for some environmental set relevant to AWT. I found that there was an AWT_TOOLKIT set. Unsetting this solved the problem!!!

$unset AWT_TOOLKIT
$arduino